as a result of small, regular releases from other less visible sources. Nearly two thirds of all marine oil pollution comes from three sources:runoff from streets, improper discharge of lubricating oil from machines or automobile crankcases and intentional oil discharges thatoccur during the loading and unloading of tankers. Oil tankers often use sea water as ballast to stabilize the ship after they have discharged their oil. This oil contaminated water is then discharged
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